Refrigeration & Air-Conditioning Practice Set-3

May 18, 2021

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1. In a refrigeration system, the expansion device is connected between the

2. The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

3. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature of 40° C and an evaporator temperature of 5° C, the heat rejection factor is about

4. The capillary tube, as an expansion device, is used in

5. The minimum temperature to which water can be cooled in a cooling tower is

6. Freon group of refrigerants are

7. Most thermostatic expansion valves are set for a superheat of

8. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

9. The refrigerant after condensation process is cooled below the saturation temperature before throttling. Such a process is called

10. Highest temperature encountered in refrigeration cycle should be


 

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